diff --git a/BUILD/check-cpu b/BUILD/check-cpu
index 33bf857b845..9fa48adfb5f 100755
--- a/BUILD/check-cpu
+++ b/BUILD/check-cpu
@@ -47,8 +47,13 @@ check_cpu () {
         model_name=`sysctl -n hw.model`
         ;;
       Darwin)
-        cpu_family=`uname -p`
-        model_name=`machine`
+        cpu_family=`sysctl -n machdep.cpu.vendor`
+        model_name=`sysctl -n machdep.cpu.brand_string`
+        if [ -z "$cpu_family" -o -z "$model_name" ]
+        then  
+          cpu_family=`uname -p`
+          model_name=`machine`
+        fi  
         ;;
       *)
         cpu_family=`uname -m`;
diff --git a/mysql-test/include/mix1.inc b/mysql-test/include/mix1.inc
index 3f7b44bd9ef..6dabe4864a9 100644
--- a/mysql-test/include/mix1.inc
+++ b/mysql-test/include/mix1.inc
@@ -1498,43 +1498,12 @@ INSERT INTO t1 VALUES
   (4,1,3,'pk',NULL),(5,1,3,'c2',NULL),
   (2,1,4,'c_extra',NULL),(3,1,4,'c_extra',NULL);
 
-EXPLAIN SELECT * FROM t1 WHERE tid = 1 AND vid = 3 ORDER BY idx DESC;
+EXPLAIN SELECT * FROM t1 FORCE INDEX (PRIMARY) WHERE tid = 1 AND vid = 3 ORDER BY idx DESC;
 
-SELECT * FROM t1 WHERE tid = 1 AND vid = 3 ORDER BY idx DESC;
+SELECT * FROM t1 FORCE INDEX (PRIMARY) WHERE tid = 1 AND vid = 3 ORDER BY idx DESC;
 
 DROP TABLE t1;
 
-#
-# Bug#21704: Renaming column does not update FK definition.
-#
-
-#
-# --disable_warnings
-# DROP TABLE IF EXISTS t1;
-# DROP TABLE IF EXISTS t2;
-# --enable_warnings
-#
-# CREATE TABLE t1(id INT PRIMARY KEY)
-#   ENGINE=innodb;
-#
-# CREATE TABLE t2(
-#   t1_id INT PRIMARY KEY,
-#   CONSTRAINT fk1 FOREIGN KEY (t1_id) REFERENCES t1(id))
-#   ENGINE=innodb;
-#
-# --echo
-#
-# --disable_result_log
-# --error ER_ERROR_ON_RENAME
-# ALTER TABLE t1 CHANGE id id2 INT;
-# --enable_result_log
-#
-# --echo
-#
-# DROP TABLE t2;
-# DROP TABLE t1;
-#
-
 --echo #
 --echo # Bug #44290: explain crashes for subquery with distinct in
 --echo #             SQL_SELECT::test_quick_select
diff --git a/mysql-test/include/mtr_warnings.sql b/mysql-test/include/mtr_warnings.sql
index 73287900f3c..b99402c8031 100644
--- a/mysql-test/include/mtr_warnings.sql
+++ b/mysql-test/include/mtr_warnings.sql
@@ -139,9 +139,9 @@ INSERT INTO global_suppressions VALUES
  ("Cannot find or open table test\/bug29807 from"),
 
  /* innodb foreign key tests that fail in ALTER or RENAME produce this */
- ("InnoDB: Error: in ALTER TABLE `test`.`t[12]`"),
+ ("InnoDB: Error: in ALTER TABLE `test`.`t[123]`"),
  ("InnoDB: Error: in RENAME TABLE table `test`.`t1`"),
- ("InnoDB: Error: table `test`.`t[12]` does not exist in the InnoDB internal"),
+ ("InnoDB: Error: table `test`.`t[123]` does not exist in the InnoDB internal"),
 
  /* Test case for Bug#14233 produces the following warnings: */
  ("Stored routine 'test'.'bug14233_1': invalid value in column mysql.proc"),
diff --git a/mysql-test/lib/My/SafeProcess/safe_process.cc b/mysql-test/lib/My/SafeProcess/safe_process.cc
index dc7b7da28c7..50c433b9b39 100644
--- a/mysql-test/lib/My/SafeProcess/safe_process.cc
+++ b/mysql-test/lib/My/SafeProcess/safe_process.cc
@@ -89,7 +89,7 @@ static void die(const char* fmt, ...)
 }
 
 
-static void kill_child (void)
+static void kill_child(void)
 {
   int status= 0;
 
@@ -119,7 +119,7 @@ static void kill_child (void)
 }
 
 
-static void handle_abort (int sig)
+extern "C" void handle_abort(int sig)
 {
     message("Got signal %d, child_pid: %d, sending ABRT", sig, child_pid);
 
@@ -128,8 +128,8 @@ static void handle_abort (int sig)
     }
 }
 
-    
-static void handle_signal (int sig)
+
+extern "C" void handle_signal(int sig)
 {
   message("Got signal %d, child_pid: %d", sig, child_pid);
   terminated= 1;
@@ -152,7 +152,7 @@ int main(int argc, char* const argv[] )
   pid_t own_pid= getpid();
   pid_t parent_pid= getppid();
   bool nocore = false;
-  
+
   /* Install signal handlers */
   signal(SIGTERM, handle_signal);
   signal(SIGINT,  handle_signal);
@@ -232,10 +232,11 @@ int main(int argc, char* const argv[] )
         message("setrlimit failed, errno=%d", errno);
       }
     }
-    
+
     // Signal that child is ready
     buf= 37;
-    write(pfd[1], &buf, 1);
+    if ((write(pfd[1], &buf, 1)) < 1)
+      die("Failed to signal that child is ready");
     // Close write end
     close(pfd[1]);
 
@@ -246,8 +247,10 @@ int main(int argc, char* const argv[] )
   close(pfd[1]); // Close unused write end
 
   // Wait for child to signal it's ready
-  read(pfd[0], &buf, 1);
-  if(buf != 37)
+  if ((read(pfd[0], &buf, 1)) < 1)
+    die("Failed to read signal from child");
+
+  if (buf != 37)
     die("Didn't get 37 from pipe");
   close(pfd[0]); // Close read end
 
@@ -272,7 +275,7 @@ int main(int argc, char* const argv[] )
       if (WIFEXITED(status))
       {
         // Process has exited, collect return status
-        int ret_code= WEXITSTATUS(status);
+        ret_code= WEXITSTATUS(status);
         message("Child exit: %d", ret_code);
         // Exit with exit status of the child
         exit(ret_code);
@@ -287,6 +290,6 @@ int main(int argc, char* const argv[] )
   }
   kill_child();
 
-  exit(1);
+  return 1;
 }
 
diff --git a/mysql-test/r/bug46080.result b/mysql-test/r/bug46080.result
new file mode 100644
index 00000000000..f69c4ac1f71
--- /dev/null
+++ b/mysql-test/r/bug46080.result
@@ -0,0 +1,15 @@
+#
+# Bug #46080: group_concat(... order by) crashes server when
+#  sort_buffer_size cannot allocate
+#
+CREATE TABLE t1(a CHAR(255));
+INSERT INTO t1 VALUES ('a');
+SET @@SESSION.sort_buffer_size=5*16*1000000;
+SET @@SESSION.max_heap_table_size=5*1000000;
+# Must not crash.
+SELECT GROUP_CONCAT(a ORDER BY a) FROM t1 GROUP BY a;
+Got one of the listed errors
+DROP TABLE t1;
+SET @@SESSION.sort_buffer_size=default;
+SET @@SESSION.max_heap_table_size=default;
+End of 5.0 tests
diff --git a/mysql-test/r/innodb_bug21704.result b/mysql-test/r/innodb_bug21704.result
new file mode 100644
index 00000000000..b8e0b15d50d
--- /dev/null
+++ b/mysql-test/r/innodb_bug21704.result
@@ -0,0 +1,55 @@
+#
+# Bug#21704: Renaming column does not update FK definition.
+#
+
+# Test that it's not possible to rename columns participating in a
+# foreign key (either in the referencing or referenced table).
+
+DROP TABLE IF EXISTS t1;
+DROP TABLE IF EXISTS t2;
+DROP TABLE IF EXISTS t3;
+CREATE TABLE t1 (a INT PRIMARY KEY, b INT) ROW_FORMAT=COMPACT ENGINE=INNODB;
+CREATE TABLE t2 (a INT PRIMARY KEY, b INT,
+CONSTRAINT fk1 FOREIGN KEY (a) REFERENCES t1(a))
+ROW_FORMAT=COMPACT ENGINE=INNODB;
+CREATE TABLE t3 (a INT PRIMARY KEY, b INT, KEY(b), C INT,
+CONSTRAINT fk2 FOREIGN KEY (b) REFERENCES t3 (a))
+ROW_FORMAT=COMPACT ENGINE=INNODB;
+INSERT INTO t1 VALUES (1,1),(2,2),(3,3);
+INSERT INTO t2 VALUES (1,1),(2,2),(3,3);
+INSERT INTO t3 VALUES (1,1,1),(2,2,2),(3,3,3);
+
+# Test renaming the column in the referenced table.
+
+ALTER TABLE t1 CHANGE a c INT;
+ERROR HY000: Error on rename of '#sql-temporary' to './test/t1' (errno: 150)
+# Ensure that online column rename works.
+ALTER TABLE t1 CHANGE b c INT;
+affected rows: 0
+info: Records: 0  Duplicates: 0  Warnings: 0
+
+# Test renaming the column in the referencing table
+
+ALTER TABLE t2 CHANGE a c INT;
+ERROR HY000: Error on rename of '#sql-temporary' to './test/t2' (errno: 150)
+# Ensure that online column rename works.
+ALTER TABLE t2 CHANGE b c INT;
+affected rows: 0
+info: Records: 0  Duplicates: 0  Warnings: 0
+
+# Test with self-referential constraints
+
+ALTER TABLE t3 CHANGE a d INT;
+ERROR HY000: Error on rename of '#sql-temporary' to './test/t3' (errno: 150)
+ALTER TABLE t3 CHANGE b d INT;
+ERROR HY000: Error on rename of '#sql-temporary' to './test/t3' (errno: 150)
+# Ensure that online column rename works.
+ALTER TABLE t3 CHANGE c d INT;
+affected rows: 0
+info: Records: 0  Duplicates: 0  Warnings: 0
+
+# Cleanup.
+
+DROP TABLE t3;
+DROP TABLE t2;
+DROP TABLE t1;
diff --git a/mysql-test/r/innodb_bug42101-nonzero.result b/mysql-test/r/innodb_bug42101-nonzero.result
index 8a14296381c..277dfffdd35 100644
--- a/mysql-test/r/innodb_bug42101-nonzero.result
+++ b/mysql-test/r/innodb_bug42101-nonzero.result
@@ -11,11 +11,15 @@ set global innodb_commit_concurrency=42;
 select @@innodb_commit_concurrency;
 @@innodb_commit_concurrency
 42
+set global innodb_commit_concurrency=DEFAULT;
+select @@innodb_commit_concurrency;
+@@innodb_commit_concurrency
+1
 set global innodb_commit_concurrency=0;
 ERROR HY000: Incorrect arguments to SET
 select @@innodb_commit_concurrency;
 @@innodb_commit_concurrency
-42
+1
 set global innodb_commit_concurrency=1;
 select @@innodb_commit_concurrency;
 @@innodb_commit_concurrency
diff --git a/mysql-test/r/innodb_bug42101.result b/mysql-test/r/innodb_bug42101.result
index 9a9c8e0ce9b..805097ffe9d 100644
--- a/mysql-test/r/innodb_bug42101.result
+++ b/mysql-test/r/innodb_bug42101.result
@@ -16,3 +16,7 @@ set global innodb_commit_concurrency=0;
 select @@innodb_commit_concurrency;
 @@innodb_commit_concurrency
 0
+set global innodb_commit_concurrency=DEFAULT;
+select @@innodb_commit_concurrency;
+@@innodb_commit_concurrency
+0
diff --git a/mysql-test/r/innodb_mysql.result b/mysql-test/r/innodb_mysql.result
index 272782f6647..3ff5f04b6c6 100644
--- a/mysql-test/r/innodb_mysql.result
+++ b/mysql-test/r/innodb_mysql.result
@@ -1701,10 +1701,10 @@ INSERT INTO t1 VALUES
 (4,1,2,'c2',NULL),(5,1,2,'c1',NULL),(2,1,3,'c2',NULL),(3,1,3,'c2',NULL),
 (4,1,3,'pk',NULL),(5,1,3,'c2',NULL),
 (2,1,4,'c_extra',NULL),(3,1,4,'c_extra',NULL);
-EXPLAIN SELECT * FROM t1 WHERE tid = 1 AND vid = 3 ORDER BY idx DESC;
+EXPLAIN SELECT * FROM t1 FORCE INDEX (PRIMARY) WHERE tid = 1 AND vid = 3 ORDER BY idx DESC;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	index	vid	PRIMARY	12	NULL	16	Using where
-SELECT * FROM t1 WHERE tid = 1 AND vid = 3 ORDER BY idx DESC;
+1	SIMPLE	t1	index	NULL	PRIMARY	12	NULL	16	Using where
+SELECT * FROM t1 FORCE INDEX (PRIMARY) WHERE tid = 1 AND vid = 3 ORDER BY idx DESC;
 vid	tid	idx	name	type
 3	1	4	c_extra	NULL
 3	1	3	c2	NULL
@@ -2137,4 +2137,75 @@ GROUP BY t1.b;
 a	b	c	d	a	b	e	a	b
 1	1	1	0	1	1	2	1	1
 DROP TABLE t1, t2, t3;
+#
+# Bug #45828: Optimizer won't use partial primary key if another 
+# index can prevent filesort
+#
+CREATE TABLE `t1` (
+c1 int NOT NULL,
+c2 int NOT NULL,
+c3 int NOT NULL,
+PRIMARY KEY (c1,c2),
+KEY  (c3)
+) ENGINE=InnoDB;
+INSERT INTO t1 VALUES (5,2,1246276747);
+INSERT INTO t1 VALUES (2,1,1246281721);
+INSERT INTO t1 VALUES (7,3,1246281756);
+INSERT INTO t1 VALUES (4,2,1246282139);
+INSERT INTO t1 VALUES (3,1,1246282230);
+INSERT INTO t1 VALUES (1,0,1246282712);
+INSERT INTO t1 VALUES (8,3,1246282765);
+INSERT INTO t1 SELECT c1+10,c2+10,c3+10 FROM t1;
+INSERT INTO t1 SELECT c1+100,c2+100,c3+100 from t1;
+INSERT INTO t1 SELECT c1+1000,c2+1000,c3+1000 from t1;
+INSERT INTO t1 SELECT c1+10000,c2+10000,c3+10000 from t1;
+INSERT INTO t1 SELECT c1+100000,c2+100000,c3+100000 from t1;
+INSERT INTO t1 SELECT c1+1000000,c2+1000000,c3+1000000 from t1;
+SELECT * FROM t1 WHERE c1 = 99999999 AND c3 > 1 ORDER BY c3;
+c1	c2	c3
+EXPLAIN SELECT * FROM t1 WHERE c1 = 99999999 AND c3 > 1 ORDER BY c3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	PRIMARY,c3	PRIMARY	4	const	1	Using where; Using filesort
+EXPLAIN SELECT * FROM t1 FORCE INDEX (PRIMARY) WHERE c1 = 99999999 AND c3 > 1 ORDER BY c3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	PRIMARY	PRIMARY	4	const	1	Using where; Using filesort
+CREATE TABLE t2 (
+c1 int NOT NULL,
+c2 int NOT NULL,
+c3 int NOT NULL,
+KEY (c1,c2),
+KEY (c3)
+) ENGINE=InnoDB;
+explain SELECT * FROM t2 WHERE c1 = 99999999 AND c3 > 1 ORDER BY c3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ref	c1,c3	c1	4	const	1	Using where; Using filesort
+DROP TABLE t1,t2;
+#
+# 36259: Optimizing with ORDER BY
+#
+CREATE TABLE t1 (
+a INT NOT NULL AUTO_INCREMENT,
+b INT NOT NULL,
+c INT NOT NULL,
+d VARCHAR(5),
+e INT NOT NULL,
+PRIMARY KEY (a), KEY i2 (b,c,d)
+) ENGINE=InnoDB;
+INSERT INTO t1 (b,c,d,e) VALUES (1,1,'a',1), (2,2,'b',2);
+INSERT INTO t1 (b,c,d,e) SELECT RAND()*10000, RAND()*10000, d, e FROM t1;
+INSERT INTO t1 (b,c,d,e) SELECT RAND()*10000, RAND()*10000, d, e FROM t1;
+INSERT INTO t1 (b,c,d,e) SELECT RAND()*10000, RAND()*10000, d, e FROM t1;
+INSERT INTO t1 (b,c,d,e) SELECT RAND()*10000, RAND()*10000, d, e FROM t1;
+INSERT INTO t1 (b,c,d,e) SELECT RAND()*10000, RAND()*10000, d, e FROM t1;
+INSERT INTO t1 (b,c,d,e) SELECT RAND()*10000, RAND()*10000, d, e FROM t1;
+EXPLAIN SELECT * FROM t1 WHERE b=1 AND c=1 ORDER BY a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	i2	i2	8	const,const	1	Using where; Using filesort
+EXPLAIN SELECT * FROM t1 FORCE INDEX(i2) WHERE b=1 and c=1 ORDER BY a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	i2	i2	8	const,const	1	Using where; Using filesort
+EXPLAIN SELECT * FROM t1 FORCE INDEX(PRIMARY) WHERE b=1 AND c=1 ORDER BY a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	NULL	PRIMARY	4	NULL	128	Using where
+DROP TABLE t1;
 End of 5.1 tests
diff --git a/mysql-test/suite/ibmdb2i/r/ibmdb2i_bug_45983.result b/mysql-test/suite/ibmdb2i/r/ibmdb2i_bug_45983.result
new file mode 100644
index 00000000000..b9f4dcfc656
--- /dev/null
+++ b/mysql-test/suite/ibmdb2i/r/ibmdb2i_bug_45983.result
@@ -0,0 +1,20 @@
+set ibmdb2i_create_index_option=1;
+drop schema if exists test1;
+create schema test1;
+use test1;
+CREATE TABLE t1 (f int primary key, index(f)) engine=ibmdb2i;
+drop table t1;
+CREATE TABLE t1 (f char(10) collate utf8_bin primary key, index(f)) engine=ibmdb2i;
+drop table t1;
+CREATE TABLE t1 (f char(10) collate latin1_swedish_ci primary key, index(f)) engine=ibmdb2i;
+drop table t1;
+CREATE TABLE t1 (f char(10) collate latin1_swedish_ci primary key, i int, index i(i,f)) engine=ibmdb2i;
+drop table t1;
+create table fd (SQSSEQ CHAR(10)) engine=ibmdb2i;
+select * from fd;
+SQSSEQ
+*HEX
+*HEX
+*HEX
+*HEX
+drop table fd;
diff --git a/mysql-test/suite/ibmdb2i/t/ibmdb2i_bug_45983.test b/mysql-test/suite/ibmdb2i/t/ibmdb2i_bug_45983.test
new file mode 100644
index 00000000000..695d8e90ada
--- /dev/null
+++ b/mysql-test/suite/ibmdb2i/t/ibmdb2i_bug_45983.test
@@ -0,0 +1,47 @@
+source suite/ibmdb2i/include/have_ibmdb2i.inc;
+
+# Confirm that ibmdb2i_create_index_option causes additional *HEX sorted indexes to be created for all non-binary keys.
+
+set ibmdb2i_create_index_option=1;
+--disable_warnings
+drop schema if exists test1;
+create schema test1;
+use test1;
+--enable_warnings
+
+--disable_abort_on_error
+--error 0,255
+exec system "DLTF QGPL/FDOUT" > /dev/null;
+--enable_abort_on_error
+
+#No additional index because no string fields in key
+CREATE TABLE t1 (f int primary key, index(f)) engine=ibmdb2i;
+--error 255
+exec system "DSPFD FILE(\"test1\"/PRIM0001) TYPE(*SEQ) OUTPUT(*OUTFILE) OUTFILE(QGPL/FDOUT) OUTMBR(*FIRST *ADD)" > /dev/null;
+--error 255
+exec system "DSPFD FILE(\"test1\"/\"f___H_t1\") TYPE(*SEQ) OUTPUT(*OUTFILE) OUTFILE(QGPL/FDOUT) OUTMBR(*FIRST *ADD)" > /dev/null;
+drop table t1;
+
+#No additional index because binary sorting
+CREATE TABLE t1 (f char(10) collate utf8_bin primary key, index(f)) engine=ibmdb2i;
+--error 255
+exec system "DSPFD FILE(\"test1\"/PRIM0001) TYPE(*SEQ) OUTPUT(*OUTFILE) OUTFILE(QGPL/FDOUT) OUTMBR(*FIRST *ADD)" > /dev/null;
+--error 255
+exec system "DSPFD FILE(\"test1\"/\"f___H_t1\") TYPE(*SEQ) OUTPUT(*OUTFILE) OUTFILE(QGPL/FDOUT) OUTMBR(*FIRST *ADD)" > /dev/null;
+drop table t1;
+
+CREATE TABLE t1 (f char(10) collate latin1_swedish_ci primary key, index(f)) engine=ibmdb2i;
+exec system "DSPFD FILE(\"test1\"/PRIM0001) TYPE(*SEQ) OUTPUT(*OUTFILE) OUTFILE(QGPL/FDOUT) OUTMBR(*FIRST *ADD)" > /dev/null;
+exec system "DSPFD FILE(\"test1\"/\"f___H_t1\") TYPE(*SEQ) OUTPUT(*OUTFILE) OUTFILE(QGPL/FDOUT) OUTMBR(*FIRST *ADD)" > /dev/null;
+drop table t1;
+
+CREATE TABLE t1 (f char(10) collate latin1_swedish_ci primary key, i int, index i(i,f)) engine=ibmdb2i;
+exec system "DSPFD FILE(\"test1\"/PRIM0001) TYPE(*SEQ) OUTPUT(*OUTFILE) OUTFILE(QGPL/FDOUT) OUTMBR(*FIRST *ADD)" > /dev/null;
+exec system "DSPFD FILE(\"test1\"/\"i___H_t1\") TYPE(*SEQ) OUTPUT(*OUTFILE) OUTFILE(QGPL/FDOUT) OUTMBR(*FIRST *ADD)" > /dev/null;
+drop table t1;
+
+
+create table fd (SQSSEQ CHAR(10)) engine=ibmdb2i;
+system system "CPYF FROMFILE(QGPL/FDOUT) TOFILE(\"test1\"/\"fd\") mbropt(*replace) fmtopt(*drop *map)" > /dev/null;
+select * from fd;
+drop table fd;
diff --git a/mysql-test/suite/parts/r/partition_auto_increment_memory.result b/mysql-test/suite/parts/r/partition_auto_increment_memory.result
index 77bab79f020..f4d783825f4 100644
--- a/mysql-test/suite/parts/r/partition_auto_increment_memory.result
+++ b/mysql-test/suite/parts/r/partition_auto_increment_memory.result
@@ -381,12 +381,12 @@ Table	Create Table
 t1	CREATE TABLE `t1` (
   `c1` int(11) NOT NULL AUTO_INCREMENT,
   PRIMARY KEY (`c1`)
-) ENGINE=MEMORY AUTO_INCREMENT=28 DEFAULT CHARSET=latin1
+) ENGINE=MEMORY AUTO_INCREMENT=2 DEFAULT CHARSET=latin1
 /*!50100 PARTITION BY HASH (c1)
 PARTITIONS 2 */
 SELECT * FROM t1 ORDER BY c1;
 c1
-27
+1
 INSERT INTO t1 VALUES (100);
 INSERT INTO t1 VALUES (NULL);
 DELETE FROM t1 WHERE c1 >= 100;
diff --git a/mysql-test/suite/parts/r/partition_auto_increment_myisam.result b/mysql-test/suite/parts/r/partition_auto_increment_myisam.result
index b5b001ec17a..6abf08b68a0 100644
--- a/mysql-test/suite/parts/r/partition_auto_increment_myisam.result
+++ b/mysql-test/suite/parts/r/partition_auto_increment_myisam.result
@@ -381,12 +381,12 @@ Table	Create Table
 t1	CREATE TABLE `t1` (
   `c1` int(11) NOT NULL AUTO_INCREMENT,
   PRIMARY KEY (`c1`)
-) ENGINE=MyISAM AUTO_INCREMENT=28 DEFAULT CHARSET=latin1
+) ENGINE=MyISAM AUTO_INCREMENT=2 DEFAULT CHARSET=latin1
 /*!50100 PARTITION BY HASH (c1)
 PARTITIONS 2 */
 SELECT * FROM t1 ORDER BY c1;
 c1
-27
+1
 INSERT INTO t1 VALUES (100);
 INSERT INTO t1 VALUES (NULL);
 DELETE FROM t1 WHERE c1 >= 100;
diff --git a/mysql-test/t/bug46080-master.opt b/mysql-test/t/bug46080-master.opt
new file mode 100644
index 00000000000..f59740afe60
--- /dev/null
+++ b/mysql-test/t/bug46080-master.opt
@@ -0,0 +1 @@
+--skip-grant-tables --skip-name-resolve --safemalloc-mem-limit=4000000
diff --git a/mysql-test/t/bug46080.test b/mysql-test/t/bug46080.test
new file mode 100644
index 00000000000..277d513f3e5
--- /dev/null
+++ b/mysql-test/t/bug46080.test
@@ -0,0 +1,20 @@
+--echo #
+--echo # Bug #46080: group_concat(... order by) crashes server when
+--echo #  sort_buffer_size cannot allocate
+--echo #
+
+CREATE TABLE t1(a CHAR(255));
+INSERT INTO t1 VALUES ('a');
+
+SET @@SESSION.sort_buffer_size=5*16*1000000;
+SET @@SESSION.max_heap_table_size=5*1000000;
+
+--echo # Must not crash.
+--error 5,0
+SELECT GROUP_CONCAT(a ORDER BY a) FROM t1 GROUP BY a;
+
+DROP TABLE t1;
+SET @@SESSION.sort_buffer_size=default;
+SET @@SESSION.max_heap_table_size=default;
+
+--echo End of 5.0 tests
diff --git a/mysql-test/t/innodb_bug21704.test b/mysql-test/t/innodb_bug21704.test
new file mode 100644
index 00000000000..c649b61034c
--- /dev/null
+++ b/mysql-test/t/innodb_bug21704.test
@@ -0,0 +1,96 @@
+-- source include/have_innodb.inc
+
+--echo #
+--echo # Bug#21704: Renaming column does not update FK definition.
+--echo #
+
+--echo
+--echo # Test that it's not possible to rename columns participating in a
+--echo # foreign key (either in the referencing or referenced table).
+--echo
+
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+DROP TABLE IF EXISTS t2;
+DROP TABLE IF EXISTS t3;
+--enable_warnings
+
+CREATE TABLE t1 (a INT PRIMARY KEY, b INT) ROW_FORMAT=COMPACT ENGINE=INNODB;
+
+CREATE TABLE t2 (a INT PRIMARY KEY, b INT,
+                 CONSTRAINT fk1 FOREIGN KEY (a) REFERENCES t1(a))
+ROW_FORMAT=COMPACT ENGINE=INNODB;
+
+CREATE TABLE t3 (a INT PRIMARY KEY, b INT, KEY(b), C INT,
+  CONSTRAINT fk2 FOREIGN KEY (b) REFERENCES t3 (a))
+ROW_FORMAT=COMPACT ENGINE=INNODB;
+
+INSERT INTO t1 VALUES (1,1),(2,2),(3,3);
+INSERT INTO t2 VALUES (1,1),(2,2),(3,3);
+INSERT INTO t3 VALUES (1,1,1),(2,2,2),(3,3,3);
+
+--echo
+--echo # Test renaming the column in the referenced table.
+--echo
+
+# mysqltest first does replace_regex, then replace_result
+--replace_regex /'[^']*test\/#sql-[0-9a-f_]*'/'#sql-temporary'/
+# Embedded server doesn't chdir to data directory
+--replace_result $MYSQLTEST_VARDIR . mysqld.1/data/ ''
+--error ER_ERROR_ON_RENAME
+ALTER TABLE t1 CHANGE a c INT;
+
+--echo # Ensure that online column rename works.
+
+--enable_info
+ALTER TABLE t1 CHANGE b c INT;
+--disable_info
+
+--echo
+--echo # Test renaming the column in the referencing table
+--echo
+
+# mysqltest first does replace_regex, then replace_result
+--replace_regex /'[^']*test\/#sql-[0-9a-f_]*'/'#sql-temporary'/
+# Embedded server doesn't chdir to data directory
+--replace_result $MYSQLTEST_VARDIR . mysqld.1/data/ ''
+--error ER_ERROR_ON_RENAME
+ALTER TABLE t2 CHANGE a c INT;
+
+--echo # Ensure that online column rename works.
+
+--enable_info
+ALTER TABLE t2 CHANGE b c INT;
+--disable_info
+
+--echo
+--echo # Test with self-referential constraints
+--echo
+
+# mysqltest first does replace_regex, then replace_result
+--replace_regex /'[^']*test\/#sql-[0-9a-f_]*'/'#sql-temporary'/
+# Embedded server doesn't chdir to data directory
+--replace_result $MYSQLTEST_VARDIR . mysqld.1/data/ ''
+--error ER_ERROR_ON_RENAME
+ALTER TABLE t3 CHANGE a d INT;
+
+# mysqltest first does replace_regex, then replace_result
+--replace_regex /'[^']*test\/#sql-[0-9a-f_]*'/'#sql-temporary'/
+# Embedded server doesn't chdir to data directory
+--replace_result $MYSQLTEST_VARDIR . mysqld.1/data/ ''
+--error ER_ERROR_ON_RENAME
+ALTER TABLE t3 CHANGE b d INT;
+
+--echo # Ensure that online column rename works.
+
+--enable_info
+ALTER TABLE t3 CHANGE c d INT;
+--disable_info
+
+--echo
+--echo # Cleanup.
+--echo
+
+DROP TABLE t3;
+DROP TABLE t2;
+DROP TABLE t1;
diff --git a/mysql-test/t/innodb_bug42101-nonzero.test b/mysql-test/t/innodb_bug42101-nonzero.test
index c691a234c51..685fdf20489 100644
--- a/mysql-test/t/innodb_bug42101-nonzero.test
+++ b/mysql-test/t/innodb_bug42101-nonzero.test
@@ -12,6 +12,8 @@ set global innodb_commit_concurrency=1;
 select @@innodb_commit_concurrency;
 set global innodb_commit_concurrency=42;
 select @@innodb_commit_concurrency;
+set global innodb_commit_concurrency=DEFAULT;
+select @@innodb_commit_concurrency;
 --error ER_WRONG_ARGUMENTS
 set global innodb_commit_concurrency=0;
 select @@innodb_commit_concurrency;
diff --git a/mysql-test/t/innodb_bug42101.test b/mysql-test/t/innodb_bug42101.test
index 13d531ecde7..b6536490d48 100644
--- a/mysql-test/t/innodb_bug42101.test
+++ b/mysql-test/t/innodb_bug42101.test
@@ -15,3 +15,5 @@ set global innodb_commit_concurrency=42;
 select @@innodb_commit_concurrency;
 set global innodb_commit_concurrency=0;
 select @@innodb_commit_concurrency;
+set global innodb_commit_concurrency=DEFAULT;
+select @@innodb_commit_concurrency;
diff --git a/mysql-test/t/innodb_mysql.test b/mysql-test/t/innodb_mysql.test
index 3e1968b8007..c643465b2f3 100644
--- a/mysql-test/t/innodb_mysql.test
+++ b/mysql-test/t/innodb_mysql.test
@@ -380,4 +380,85 @@ SELECT * FROM t1, t2, t3
 
 DROP TABLE t1, t2, t3;
 
+--echo #
+--echo # Bug #45828: Optimizer won't use partial primary key if another 
+--echo # index can prevent filesort
+--echo #
+
+# Create the table
+CREATE TABLE `t1` (
+  c1 int NOT NULL,
+  c2 int NOT NULL,
+  c3 int NOT NULL,
+  PRIMARY KEY (c1,c2),
+  KEY  (c3)
+) ENGINE=InnoDB;
+
+# populate with data
+INSERT INTO t1 VALUES (5,2,1246276747);
+INSERT INTO t1 VALUES (2,1,1246281721);
+INSERT INTO t1 VALUES (7,3,1246281756);
+INSERT INTO t1 VALUES (4,2,1246282139);
+INSERT INTO t1 VALUES (3,1,1246282230);
+INSERT INTO t1 VALUES (1,0,1246282712);
+INSERT INTO t1 VALUES (8,3,1246282765);
+INSERT INTO t1 SELECT c1+10,c2+10,c3+10 FROM t1;
+INSERT INTO t1 SELECT c1+100,c2+100,c3+100 from t1;
+INSERT INTO t1 SELECT c1+1000,c2+1000,c3+1000 from t1;
+INSERT INTO t1 SELECT c1+10000,c2+10000,c3+10000 from t1;
+INSERT INTO t1 SELECT c1+100000,c2+100000,c3+100000 from t1;
+INSERT INTO t1 SELECT c1+1000000,c2+1000000,c3+1000000 from t1;
+
+# query and no rows will match the c1 condition, whereas all will match c3
+SELECT * FROM t1 WHERE c1 = 99999999 AND c3 > 1 ORDER BY c3;
+
+# SHOULD use the pk.
+# index on c3 will be used instead of primary key
+EXPLAIN SELECT * FROM t1 WHERE c1 = 99999999 AND c3 > 1 ORDER BY c3;
+
+# if we force the primary key, we can see the estimate is 1 
+EXPLAIN SELECT * FROM t1 FORCE INDEX (PRIMARY) WHERE c1 = 99999999 AND c3 > 1 ORDER BY c3;
+
+
+CREATE TABLE t2 (
+  c1 int NOT NULL,
+  c2 int NOT NULL,
+  c3 int NOT NULL,
+  KEY (c1,c2),
+  KEY (c3)
+) ENGINE=InnoDB;
+
+# SHOULD use the pk.
+# if we switch it from a primary key to a regular index, it works correctly as well
+explain SELECT * FROM t2 WHERE c1 = 99999999 AND c3 > 1 ORDER BY c3;
+
+DROP TABLE t1,t2;
+
+
+--echo #
+--echo # 36259: Optimizing with ORDER BY
+--echo #
+
+CREATE TABLE t1 (
+  a INT NOT NULL AUTO_INCREMENT,
+  b INT NOT NULL,
+  c INT NOT NULL,
+  d VARCHAR(5),
+  e INT NOT NULL,
+  PRIMARY KEY (a), KEY i2 (b,c,d)
+) ENGINE=InnoDB;
+
+INSERT INTO t1 (b,c,d,e) VALUES (1,1,'a',1), (2,2,'b',2);
+INSERT INTO t1 (b,c,d,e) SELECT RAND()*10000, RAND()*10000, d, e FROM t1;
+INSERT INTO t1 (b,c,d,e) SELECT RAND()*10000, RAND()*10000, d, e FROM t1;
+INSERT INTO t1 (b,c,d,e) SELECT RAND()*10000, RAND()*10000, d, e FROM t1;
+INSERT INTO t1 (b,c,d,e) SELECT RAND()*10000, RAND()*10000, d, e FROM t1;
+INSERT INTO t1 (b,c,d,e) SELECT RAND()*10000, RAND()*10000, d, e FROM t1;
+INSERT INTO t1 (b,c,d,e) SELECT RAND()*10000, RAND()*10000, d, e FROM t1;
+EXPLAIN SELECT * FROM t1 WHERE b=1 AND c=1 ORDER BY a;
+EXPLAIN SELECT * FROM t1 FORCE INDEX(i2) WHERE b=1 and c=1 ORDER BY a;
+EXPLAIN SELECT * FROM t1 FORCE INDEX(PRIMARY) WHERE b=1 AND c=1 ORDER BY a;
+
+DROP TABLE t1;
+
 --echo End of 5.1 tests
diff --git a/sql/ha_partition.cc b/sql/ha_partition.cc
index 67bc3156260..74742f58028 100644
--- a/sql/ha_partition.cc
+++ b/sql/ha_partition.cc
@@ -3179,6 +3179,7 @@ int ha_partition::delete_row(const uchar *buf)
 int ha_partition::delete_all_rows()
 {
   int error;
+  bool truncate= FALSE;
   handler **file;
   THD *thd= ha_thd();
   DBUG_ENTER("ha_partition::delete_all_rows");
@@ -3190,12 +3191,16 @@ int ha_partition::delete_all_rows()
     ha_data->next_auto_inc_val= 0;
     ha_data->auto_inc_initialized= FALSE;
     unlock_auto_increment();
+    truncate= TRUE;
   }
   file= m_file;
   do
   {
     if ((error= (*file)->ha_delete_all_rows()))
       DBUG_RETURN(error);
+    /* Ignore the error */
+    if (truncate)
+      (void) (*file)->ha_reset_auto_increment(0);
   } while (*(++file));
   DBUG_RETURN(0);
 }
diff --git a/sql/item_sum.cc b/sql/item_sum.cc
index 46a58351872..38251294053 100644
--- a/sql/item_sum.cc
+++ b/sql/item_sum.cc
@@ -3327,8 +3327,13 @@ bool Item_func_group_concat::add()
 
   TREE_ELEMENT *el= 0;                          // Only for safety
   if (row_eligible && tree)
+  {
     el= tree_insert(tree, table->record[0] + table->s->null_bytes, 0,
                     tree->custom_arg);
+    /* check if there was enough memory to insert the row */
+    if (!el)
+      return 1;
+  }
   /*
     If the row is not a duplicate (el->count == 1)
     we can dump the row here in case of GROUP_CONCAT(DISTINCT...)
diff --git a/sql/rpl_rli.cc b/sql/rpl_rli.cc
index 45c0efb10c2..18fbae9bb9d 100644
--- a/sql/rpl_rli.cc
+++ b/sql/rpl_rli.cc
@@ -947,6 +947,7 @@ int purge_relay_logs(Relay_log_info* rli, THD *thd, bool just_reset,
   if (count_relay_log_space(rli))
   {
     *errmsg= "Error counting relay log space";
+    error=1;
     goto err;
   }
   if (!just_reset)
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 37721660184..401745bd9b8 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -13132,9 +13132,17 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
     for (nr=0; nr < table->s->keys ; nr++)
     {
       int direction;
+
       if (keys.is_set(nr) &&
           (direction= test_if_order_by_key(order, table, nr, &used_key_parts)))
       {
+        /*
+          At this point we are sure that ref_key is a non-ordering
+          key (where "ordering key" is a key that will return rows
+          in the order required by ORDER BY).
+        */
+        DBUG_ASSERT (ref_key != (int) nr);
+
         bool is_covering= table->covering_keys.is_set(nr) ||
                           (nr == table->s->primary_key &&
                           table->file->primary_key_is_clustered());
@@ -13215,7 +13223,7 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
 	  */
           index_scan_time= select_limit/rec_per_key *
 	                   min(rec_per_key, table->file->scan_time());
-          if (is_covering || 
+          if ((ref_key < 0 && is_covering) || 
               (ref_key < 0 && (group || table->force_index)) ||
               index_scan_time < read_time)
           {
diff --git a/storage/heap/ha_heap.cc b/storage/heap/ha_heap.cc
index 19863d83874..fb7c13e4e41 100644
--- a/storage/heap/ha_heap.cc
+++ b/storage/heap/ha_heap.cc
@@ -419,6 +419,14 @@ int ha_heap::delete_all_rows()
   return 0;
 }
 
+
+int ha_heap::reset_auto_increment(ulonglong value)
+{
+  file->s->auto_increment= value;
+  return 0;
+}
+
+
 int ha_heap::external_lock(THD *thd, int lock_type)
 {
   return 0;					// No external locking
diff --git a/storage/heap/ha_heap.h b/storage/heap/ha_heap.h
index 5c5ad43658e..22722129f4c 100644
--- a/storage/heap/ha_heap.h
+++ b/storage/heap/ha_heap.h
@@ -98,6 +98,7 @@ public:
   int reset();
   int external_lock(THD *thd, int lock_type);
   int delete_all_rows(void);
+  int reset_auto_increment(ulonglong value);
   int disable_indexes(uint mode);
   int enable_indexes(uint mode);
   int indexes_are_disabled(void);
diff --git a/storage/ibmdb2i/ha_ibmdb2i.cc b/storage/ibmdb2i/ha_ibmdb2i.cc
index 5cf9568be67..0fc2d1e83dc 100644
--- a/storage/ibmdb2i/ha_ibmdb2i.cc
+++ b/storage/ibmdb2i/ha_ibmdb2i.cc
@@ -2230,34 +2230,19 @@ int ha_ibmdb2i::create(const char *name, TABLE *table_arg,
     } 
   }
   
-  bool primaryHasStringField = false;
-
+  String fieldDefinition(128);
+  
   if (table_arg->s->primary_key != MAX_KEY && !isTemporary)
   {
-    KEY& curKey = table_arg->key_info[table_arg->s->primary_key];
-    query.append(STRING_WITH_LEN(", PRIMARY KEY( "));
-    for (int j = 0; j < curKey.key_parts; ++j)
-    {
-      if (j != 0)
-      {
-        query.append( STRING_WITH_LEN(" , ") );
-      }
-      Field* field = curKey.key_part[j].field;
-      convertMySQLNameToDB2Name(field->field_name, colName, sizeof(colName));
-      query.append(colName);
-      enum_field_types type = field->real_type();
-      if (type == MYSQL_TYPE_VARCHAR || type == MYSQL_TYPE_BLOB ||
-          type == MYSQL_TYPE_STRING)
-      {
-        rc = updateAssociatedSortSequence(field->charset(),
-                                          &fileSortSequenceType,
-                                          fileSortSequence,
-                                          fileSortSequenceLibrary);
-        if (rc) DBUG_RETURN (rc);
-        primaryHasStringField = true;
-      }
-    }
-    query.append(STRING_WITH_LEN(" ) "));
+    query.append(STRING_WITH_LEN(", PRIMARY KEY "));
+    rc = buildIndexFieldList(fieldDefinition, 
+                             table_arg->key_info[table_arg->s->primary_key],
+                             true,
+                             &fileSortSequenceType,
+                             fileSortSequence,
+                             fileSortSequenceLibrary);
+    if (rc) DBUG_RETURN(rc);
+    query.append(fieldDefinition);
   }
 
   rc = buildDB2ConstraintString(thd->lex, 
@@ -2283,6 +2268,19 @@ int ha_ibmdb2i::create(const char *name, TABLE *table_arg,
   SqlStatementStream sqlStream(query.length());
   sqlStream.addStatement(query,fileSortSequence,fileSortSequenceLibrary);
   
+  if (table_arg->s->primary_key != MAX_KEY && 
+      !isTemporary &&
+      (THDVAR(thd, create_index_option)==1) &&
+      (fileSortSequenceType != 'B') &&
+      (fileSortSequenceType != ' '))
+  {
+    rc = generateShadowIndex(sqlStream, 
+                             table_arg->key_info[table_arg->s->primary_key], 
+                             libName, 
+                             fileName, 
+                             fieldDefinition);
+    if (rc) DBUG_RETURN(rc);
+  }
   for (uint i = 0; i < table_arg->s->keys; ++i)
   {
     if (i != table_arg->s->primary_key || isTemporary)
@@ -3012,52 +3010,27 @@ int32 ha_ibmdb2i::buildCreateIndexStatement(SqlStatementStream& sqlStream,
   }
   
   String fieldDefinition(128);
-  fieldDefinition.length(0);
-  fieldDefinition.append(STRING_WITH_LEN(" ( "));
-  for (int j = 0; j < key.key_parts; ++j)
-  {
-    char colName[MAX_DB2_COLNAME_LENGTH+1];
-    if (j != 0)
-    {
-      fieldDefinition.append(STRING_WITH_LEN(" , "));
-    }
-    Field* field = key.key_part[j].field;
-    convertMySQLNameToDB2Name(field->field_name, colName, sizeof(colName));
-    fieldDefinition.append(colName);
-    rc = updateAssociatedSortSequence(field->charset(),
-                                      &fileSortSequenceType,
-                                      fileSortSequence,
-                                      fileSortSequenceLibrary);
-    if (rc) DBUG_RETURN (rc);
-  }
-  fieldDefinition.append(STRING_WITH_LEN(" ) "));
+  rc = buildIndexFieldList(fieldDefinition,
+                           key,
+                           isPrimary,
+                           &fileSortSequenceType, 
+                           fileSortSequence,
+                           fileSortSequenceLibrary);
   
+  if (rc) DBUG_RETURN(rc);
+   
   query.append(fieldDefinition);
   
   if ((THDVAR(ha_thd(), create_index_option)==1) &&
-      (fileSortSequenceType != 'B'))
+      (fileSortSequenceType != 'B') &&
+      (fileSortSequenceType != ' '))
   {
-    String shadowQuery(256);
-    shadowQuery.length(0);
-    
-    shadowQuery.append(STRING_WITH_LEN("CREATE INDEX "));
-
-    shadowQuery.append(db2LibName);
-    shadowQuery.append('.');
-    if (db2i_table::appendQualifiedIndexFileName(key.name, db2FileName, shadowQuery, db2i_table::ASCII_SQL, typeHex))
-    {
-      getErrTxt(DB2I_ERR_INVALID_NAME,"index","*generated*");
-      DBUG_RETURN(DB2I_ERR_INVALID_NAME );
-    }
-
-    shadowQuery.append(STRING_WITH_LEN(" ON "));
-
-    shadowQuery.append(db2LibName);
-    shadowQuery.append('.');
-    shadowQuery.append(db2FileName);
-    shadowQuery.append(fieldDefinition);
-    DBUG_PRINT("ha_ibmdb2i::buildCreateIndexStatement", ("Sent to DB2: %s",shadowQuery.c_ptr_safe()));
-    sqlStream.addStatement(shadowQuery,"*HEX","QSYS");
+    rc = generateShadowIndex(sqlStream, 
+                             key, 
+                             db2LibName, 
+                             db2FileName, 
+                             fieldDefinition);
+    if (rc) DBUG_RETURN(rc);
   }
     
   DBUG_PRINT("ha_ibmdb2i::buildCreateIndexStatement", ("Sent to DB2: %s",query.c_ptr_safe()));
@@ -3066,7 +3039,97 @@ int32 ha_ibmdb2i::buildCreateIndexStatement(SqlStatementStream& sqlStream,
   DBUG_RETURN(0);
 }
 
+/**
+  Generate the SQL syntax for the list of fields to be assigned to the 
+  specified key. The corresponding sort sequence is also calculated.
+      
+  @param[out] appendHere  The string to receive the generated SQL
+  @param key  The key to evaluate
+  @param isPrimary  True if this is being generated on behalf of the primary key
+  @param[out] fileSortSequenceType  The type of the associated sort sequence
+  @param[out] fileSortSequence  The name of the associated sort sequence
+  @param[out] fileSortSequenceLibrary  The library of the associated sort sequence
+  
+  @return  0 if successful; error value otherwise
+*/
+int32 ha_ibmdb2i::buildIndexFieldList(String& appendHere,
+                                      const KEY& key,
+                                      bool isPrimary,
+                                      char* fileSortSequenceType, 
+                                      char* fileSortSequence, 
+                                      char* fileSortSequenceLibrary)
+{
+  DBUG_ENTER("ha_ibmdb2i::buildIndexFieldList");
+  appendHere.append(STRING_WITH_LEN(" ( "));
+  for (int j = 0; j < key.key_parts; ++j)
+  {
+    char colName[MAX_DB2_COLNAME_LENGTH+1];
+    if (j != 0)
+    {
+      appendHere.append(STRING_WITH_LEN(" , "));
+    }
+    
+    KEY_PART_INFO& kpi = key.key_part[j];
+    Field* field = kpi.field;
+    
+    convertMySQLNameToDB2Name(field->field_name, 
+                              colName, 
+                              sizeof(colName));
+    appendHere.append(colName);
+    
+    int32 rc;
+    rc = updateAssociatedSortSequence(field->charset(),
+                                      fileSortSequenceType,
+                                      fileSortSequence,
+                                      fileSortSequenceLibrary);
+    if (rc) DBUG_RETURN (rc);
+  }
+    
+  appendHere.append(STRING_WITH_LEN(" ) "));
+  
+  DBUG_RETURN(0);
+}
 
+
+/**
+  Generate an SQL statement that defines a *HEX sorted index to implement 
+  the ibmdb2i_create_index.
+      
+  @param[out] stream  The stream to append the generated statement to
+  @param key  The key to evaluate
+  @param[out] libName  The library containg the table
+  @param[out] fileName  The DB2-compatible name of the table 
+  @param[out] fieldDefinition  The list of the fields in the index, in SQL syntax
+  
+  @return  0 if successful; error value otherwise
+*/
+int32 ha_ibmdb2i::generateShadowIndex(SqlStatementStream& stream, 
+                                      const KEY& key,
+                                      const char* libName,
+                                      const char* fileName,
+                                      const String& fieldDefinition)
+{
+  String shadowQuery(256);
+  shadowQuery.length(0);
+  shadowQuery.append(STRING_WITH_LEN("CREATE INDEX "));
+  shadowQuery.append(libName);
+  shadowQuery.append('.');
+  if (db2i_table::appendQualifiedIndexFileName(key.name, fileName, shadowQuery, db2i_table::ASCII_SQL, typeHex))
+  {
+    getErrTxt(DB2I_ERR_INVALID_NAME,"index","*generated*");
+    return DB2I_ERR_INVALID_NAME;
+  }
+  shadowQuery.append(STRING_WITH_LEN(" ON "));
+  shadowQuery.append(libName);
+  shadowQuery.append('.');
+  shadowQuery.append(fileName);
+  shadowQuery.append(fieldDefinition);
+  DBUG_PRINT("ha_ibmdb2i::generateShadowIndex", ("Sent to DB2: %s",shadowQuery.c_ptr_safe()));
+  stream.addStatement(shadowQuery,"*HEX","QSYS");
+  return 0;
+}
+  
+  
 void ha_ibmdb2i::doInitialRead(char orientation,
                                 uint32 rowsToBuffer,
                                 ILEMemHandle key,
diff --git a/storage/ibmdb2i/ha_ibmdb2i.h b/storage/ibmdb2i/ha_ibmdb2i.h
index 006b6b163b8..b2a43232f2d 100644
--- a/storage/ibmdb2i/ha_ibmdb2i.h
+++ b/storage/ibmdb2i/ha_ibmdb2i.h
@@ -530,6 +530,13 @@ private:
                                  bool isPrimary,
                                  const char* db2LibName,    
                                  const char* db2FileName);
+  
+  int32 buildIndexFieldList(String& appendHere,
+                            const KEY& key,
+                            bool isPrimary,
+                            char* fileSortSequenceType, 
+                            char* fileSortSequence, 
+                            char* fileSortSequenceLibrary);
 
   // Specify NULL for data when using the data pointed to by field
   int32 convertMySQLtoDB2(Field* field, const DB2Field& db2Field, char* db2Buf, const uchar* data = NULL); 
@@ -806,4 +813,10 @@ private:
     query.append(STRING_WITH_LEN(" RCDFMT "));
     query.append(rcdfmt);
   }
+  
+  int32 generateShadowIndex(SqlStatementStream& stream, 
+                           const KEY& key,
+                           const char* libName,
+                           const char* fileName,
+                           const String& fieldDefinition);
 };
diff --git a/storage/innobase/Makefile.am b/storage/innobase/Makefile.am
index 0143aee8e1a..3df9a6bf988 100644
--- a/storage/innobase/Makefile.am
+++ b/storage/innobase/Makefile.am
@@ -57,7 +57,7 @@ noinst_HEADERS=		include/btr0btr.h include/btr0btr.ic		\
 			include/ha0ha.ic include/hash0hash.h		\
 			include/hash0hash.ic include/ibuf0ibuf.h	\
 			include/ibuf0ibuf.ic include/ibuf0types.h	\
-			include/lock0iter.h include/fsp0types.h		\
+			include/lock0iter.h 				\
 			include/lock0lock.h include/lock0lock.ic	\
 			include/lock0priv.h include/lock0priv.ic	\
 			include/lock0types.h include/log0log.h		\
diff --git a/storage/innobase/fil/fil0fil.c b/storage/innobase/fil/fil0fil.c
index c63d67cae60..42e5166c9e4 100644
--- a/storage/innobase/fil/fil0fil.c
+++ b/storage/innobase/fil/fil0fil.c
@@ -2745,7 +2745,7 @@ fil_open_single_table_tablespace(
 		      "InnoDB: and MySQL removed the .ibd file for this.\n"
 		      "InnoDB: Please refer to\n"
 		      "InnoDB: http://dev.mysql.com/doc/refman/5.1/en/"
-		      "innodb-troubleshooting.html\n"
+		      "innodb-troubleshooting-datadict.html\n"
 		      "InnoDB: for how to resolve the issue.\n", stderr);
 
 		mem_free(filepath);
@@ -2786,7 +2786,7 @@ fil_open_single_table_tablespace(
 			" IMPORT TABLESPACE?\n"
 			"InnoDB: Please refer to\n"
 			"InnoDB: http://dev.mysql.com/doc/refman/5.1/en/"
-			"innodb-troubleshooting.html\n"
+			"innodb-troubleshooting-datadict.html\n"
 			"InnoDB: for how to resolve the issue.\n",
 			(ulong) space_id, (ulong) id);
 
@@ -3477,7 +3477,7 @@ fil_space_for_table_exists_in_mem(
 error_exit:
 		fputs("InnoDB: Please refer to\n"
 		      "InnoDB: http://dev.mysql.com/doc/refman/5.1/en/"
-		      "innodb-troubleshooting.html\n"
+		      "innodb-troubleshooting-datadict.html\n"
 		      "InnoDB: for how to resolve the issue.\n", stderr);
 
 		mem_free(path);
diff --git a/storage/innobase/handler/ha_innodb.cc b/storage/innobase/handler/ha_innodb.cc
index 56e28cf5f14..2f29ca62000 100644
--- a/storage/innobase/handler/ha_innodb.cc
+++ b/storage/innobase/handler/ha_innodb.cc
@@ -166,6 +166,20 @@ static handler *innobase_create_handler(handlerton *hton,
 
 static const char innobase_hton_name[]= "InnoDB";
 
+/** @brief Initialize the default value of innodb_commit_concurrency.
+
+Once InnoDB is running, the innodb_commit_concurrency must not change
+from zero to nonzero. (Bug #42101)
+
+The initial default value is 0, and without this extra initialization,
+SET GLOBAL innodb_commit_concurrency=DEFAULT would set the parameter
+to 0, even if it was initially set to nonzero at the command line
+or configuration file. */
+static
+void
+innobase_commit_concurrency_init_default(void);
+/*==========================================*/
+
 /*****************************************************************
 Check for a valid value of innobase_commit_concurrency. */
 static
@@ -1775,6 +1789,8 @@ innobase_init(
 						(char*)"latin1_swedish_ci"));
 	memcpy(srv_latin1_ordering, my_charset_latin1.sort_order, 256);
 
+	innobase_commit_concurrency_init_default();
+
 	/* Since we in this module access directly the fields of a trx
 	struct, and due to different headers and flags it might happen that
 	mutex_t has a different size in this module and in InnoDB
@@ -8161,6 +8177,97 @@ innobase_set_cursor_view(
 }
 
 
+/***********************************************************************
+Check whether any of the given columns is being renamed in the table. */
+static
+bool
+column_is_being_renamed(
+/*====================*/
+					/* out: true if any of col_names is
+					being renamed in table */
+	TABLE*		table,		/* in: MySQL table */
+	uint		n_cols,		/* in: number of columns */
+	const char**	col_names)	/* in: names of the columns */
+{
+	uint		j;
+	uint		k;
+	Field*		field;
+	const char*	col_name;
+
+	for (j = 0; j < n_cols; j++) {
+		col_name = col_names[j];
+		for (k = 0; k < table->s->fields; k++) {
+			field = table->field[k];
+			if ((field->flags & FIELD_IS_RENAMED)
+			    && innobase_strcasecmp(field->field_name,
+						   col_name) == 0) {
+				return(true);
+			}
+		}
+	}
+
+	return(false);
+}
+
+/***********************************************************************
+Check whether a column in table "table" is being renamed and if this column
+is part of a foreign key, either part of another table, referencing this
+table or part of this table, referencing another table. */
+static
+bool
+foreign_key_column_is_being_renamed(
+/*================================*/
+					/* out: true if a column that
+					participates in a foreign key definition
+					is being renamed */
+	row_prebuilt_t*	prebuilt,	/* in: InnoDB prebuilt struct */
+	TABLE*		table)		/* in: MySQL table */
+{
+	dict_foreign_t*	foreign;
+
+	/* check whether there are foreign keys at all */
+	if (UT_LIST_GET_LEN(prebuilt->table->foreign_list) == 0
+	    && UT_LIST_GET_LEN(prebuilt->table->referenced_list) == 0) {
+		/* no foreign keys involved with prebuilt->table */
+
+		return(false);
+	}
+
+	row_mysql_lock_data_dictionary(prebuilt->trx);
+
+	/* Check whether any column in the foreign key constraints which refer
+	to this table is being renamed. */
+	for (foreign = UT_LIST_GET_FIRST(prebuilt->table->referenced_list);
+	     foreign != NULL;
+	     foreign = UT_LIST_GET_NEXT(referenced_list, foreign)) {
+
+		if (column_is_being_renamed(table, foreign->n_fields,
+					    foreign->referenced_col_names)) {
+
+			row_mysql_unlock_data_dictionary(prebuilt->trx);
+			return(true);
+		}
+	}
+
+	/* Check whether any column in the foreign key constraints in the
+	table is being renamed. */
+	for (foreign = UT_LIST_GET_FIRST(prebuilt->table->foreign_list);
+	     foreign != NULL;
+	     foreign = UT_LIST_GET_NEXT(foreign_list, foreign)) {
+
+		if (column_is_being_renamed(table, foreign->n_fields,
+					    foreign->foreign_col_names)) {
+
+			row_mysql_unlock_data_dictionary(prebuilt->trx);
+			return(true);
+		}
+	}
+
+	row_mysql_unlock_data_dictionary(prebuilt->trx);
+
+	return(false);
+}
+
 bool ha_innobase::check_if_incompatible_data(
 	HA_CREATE_INFO*	info,
 	uint		table_changes)
@@ -8177,6 +8284,13 @@ bool ha_innobase::check_if_incompatible_data(
 		return COMPATIBLE_DATA_NO;
 	}
 
+	/* Check if a column participating in a foreign key is being renamed.
+	There is no mechanism for updating InnoDB foreign key definitions. */
+	if (foreign_key_column_is_being_renamed(prebuilt, table)) {
+
+		return COMPATIBLE_DATA_NO;
+	}
+
 	/* Check that row format didn't change */
 	if ((info->used_fields & HA_CREATE_USED_ROW_FORMAT) &&
 		get_row_type() != info->row_type) {
@@ -8464,3 +8578,21 @@ mysql_declare_plugin(innobase)
   NULL /* reserved */
 }
 mysql_declare_plugin_end;
+
+/** @brief Initialize the default value of innodb_commit_concurrency.
+
+Once InnoDB is running, the innodb_commit_concurrency must not change
+from zero to nonzero. (Bug #42101)
+
+The initial default value is 0, and without this extra initialization,
+SET GLOBAL innodb_commit_concurrency=DEFAULT would set the parameter
+to 0, even if it was initially set to nonzero at the command line
+or configuration file. */
+static
+void
+innobase_commit_concurrency_init_default(void)
+/*==========================================*/
+{
+	MYSQL_SYSVAR_NAME(commit_concurrency).def_val
+		= innobase_commit_concurrency;
+}
diff --git a/storage/innobase/include/trx0sys.ic b/storage/innobase/include/trx0sys.ic
index 86b71df08d6..55bcc12a414 100644
--- a/storage/innobase/include/trx0sys.ic
+++ b/storage/innobase/include/trx0sys.ic
@@ -9,6 +9,7 @@ Created 3/26/1996 Heikki Tuuri
 #include "srv0srv.h"
 #include "trx0trx.h"
 #include "data0type.h"
+#include "mtr0log.h"
 
 /* The typedef for rseg slot in the file copy */
 typedef byte	trx_sysf_rseg_t;
diff --git a/storage/innobase/trx/trx0purge.c b/storage/innobase/trx/trx0purge.c
index f0e85ef1604..f0f300d918e 100644
--- a/storage/innobase/trx/trx0purge.c
+++ b/storage/innobase/trx/trx0purge.c
@@ -14,6 +14,7 @@ Created 3/26/1996 Heikki Tuuri
 
 #include "fsp0fsp.h"
 #include "mach0data.h"
+#include "mtr0log.h"
 #include "trx0rseg.h"
 #include "trx0trx.h"
 #include "trx0roll.h"
diff --git a/storage/innobase/trx/trx0sys.c b/storage/innobase/trx/trx0sys.c
index 7975950e912..19c5159e15f 100644
--- a/storage/innobase/trx/trx0sys.c
+++ b/storage/innobase/trx/trx0sys.c
@@ -13,7 +13,7 @@ Created 3/26/1996 Heikki Tuuri
 #endif
 
 #include "fsp0fsp.h"
-#include "mtr0mtr.h"
+#include "mtr0log.h"
 #include "trx0trx.h"
 #include "trx0rseg.h"
 #include "trx0undo.h"
diff --git a/storage/innobase/trx/trx0undo.c b/storage/innobase/trx/trx0undo.c
index b31580d0ce0..deb6c85e6e3 100644
--- a/storage/innobase/trx/trx0undo.c
+++ b/storage/innobase/trx/trx0undo.c
@@ -14,6 +14,7 @@ Created 3/26/1996 Heikki Tuuri
 
 #include "fsp0fsp.h"
 #include "mach0data.h"
+#include "mtr0log.h"
 #include "trx0rseg.h"
 #include "trx0trx.h"
 #include "srv0srv.h"
diff --git a/storage/myisam/ha_myisam.cc b/storage/myisam/ha_myisam.cc
index efdd9c35b0a..d0e5f5a5c88 100644
--- a/storage/myisam/ha_myisam.cc
+++ b/storage/myisam/ha_myisam.cc
@@ -1870,6 +1870,12 @@ int ha_myisam::delete_all_rows()
   return mi_delete_all_rows(file);
 }
 
+int ha_myisam::reset_auto_increment(ulonglong value)
+{
+  file->s->state.auto_increment= value;
+  return 0;
+}
+
 int ha_myisam::delete_table(const char *name)
 {
   return mi_delete_table(name);
diff --git a/storage/myisam/ha_myisam.h b/storage/myisam/ha_myisam.h
index ca44ae9ad87..55a5eac92de 100644
--- a/storage/myisam/ha_myisam.h
+++ b/storage/myisam/ha_myisam.h
@@ -101,6 +101,7 @@ class ha_myisam: public handler
   int reset(void);
   int external_lock(THD *thd, int lock_type);
   int delete_all_rows(void);
+  int reset_auto_increment(ulonglong value);
   int disable_indexes(uint mode);
   int enable_indexes(uint mode);
   int indexes_are_disabled(void);